package com.heima.gateway.filter;

import com.heima.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String uri = request.getURI().toString();
        //如果是登录请求则直接放行
        if(uri.contains("/login")){
            return chain.filter(exchange);
        }
        String token = request.getHeaders().getFirst("token");
        //判断token是否为空，空则相应401的状态码
        if(StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        Claims claimsBody = AppJwtUtil.getClaimsBody(token);
        int status = AppJwtUtil.verifyToken(claimsBody);
        if(status==-1||status==0){
            Object userId = claimsBody.get("userId");
            Object name = claimsBody.get("name");
            request.mutate().header("userId",userId.toString());
            request.mutate().header("name",name.toString());
            return chain.filter(exchange);
        }
        response.setStatusCode(HttpStatus.UNAUTHORIZED);
        return response.setComplete();
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
